Remove outdated FIXME for link rels

Change-Id: I12ffb1e19491bcd233c74262ee0d9900e848958e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412688Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807562}

third_party/blink/renderer/core/html/link_rel_attribute.cc

@@ -71,10 +71,7 @@ LinkRelAttribute::LinkRelAttribute(const String& rel) : LinkRelAttribute() {
       is_alternate_ = true;
     } else if (EqualIgnoringASCIICase(link_type, "icon")) {
       // This also allows "shortcut icon" since we just ignore the non-standard
-      // "shortcut" token.
-      // FIXME: This doesn't really follow the spec that requires "shortcut
-      // icon" to be the entire string
-      // http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon
+      // "shortcut" token (in accordance with the spec).
       icon_type_ = mojom::blink::FaviconIconType::kFavicon;
     } else if (EqualIgnoringASCIICase(link_type, "prefetch")) {
       is_link_prefetch_ = true;